WO2024009483A1 - Wireless communication system, control device, and control method - Google Patents

Wireless communication system, control device, and control method Download PDF

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Publication number
WO2024009483A1
WO2024009483A1 PCT/JP2022/027032 JP2022027032W WO2024009483A1 WO 2024009483 A1 WO2024009483 A1 WO 2024009483A1 JP 2022027032 W JP2022027032 W JP 2022027032W WO 2024009483 A1 WO2024009483 A1 WO 2024009483A1
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WIPO (PCT)
Prior art keywords
station device
mobile radio
radio station
relay station
wireless communication
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PCT/JP2022/027032
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French (fr)
Japanese (ja)
Inventor
大輔 村山
俊朗 中平
聡 高谷
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日本電信電話株式会社
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Priority to PCT/JP2022/027032 priority Critical patent/WO2024009483A1/en
Publication of WO2024009483A1 publication Critical patent/WO2024009483A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to a technique for performing ON/OFF control on a mobile radio station device such as a mobile relay station device.
  • Non-Patent Document 1 a relay station device is mounted on a moving object (forklift, etc.) that moves within a factory, etc., and the relay function is turned on/off as necessary. Techniques have been proposed to improve area quality.
  • Non-Patent Document 1 Based on the technology disclosed in Non-Patent Document 1, in order to perform appropriate communication by ON/OFF control of the mobile relay station device, it is necessary to use the mobile relay station device close to the optimal position in the ON state. be.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a technology for reducing the frequency of ON/OFF switching in a technology for performing ON/OFF control of a mobile radio station device.
  • a wireless communication system includes one or more mobile radio station devices that communicate with one or more terminal devices, an area calculation unit that calculates a placement area that includes the location of the mobile radio station device in which the communication quality of the terminal device satisfies the required quality; a selection unit that selects a mobile radio station device with a maximum residence time in the placement area based on a movement prediction of each mobile radio station device;
  • a wireless communication system comprising: a control unit that operates a wireless communication function of a mobile radio station device selected by the selection unit.
  • FIG. 1 is a diagram showing an example of the overall configuration of a wireless communication system.
  • 1 is a diagram showing an example of the overall configuration of a wireless communication system.
  • FIG. 3 is a diagram for explaining an outline of the operation.
  • FIG. 2 is a diagram showing an example of a device configuration. It is a flowchart for explaining operation. It is a diagram showing an example of the hardware configuration of the device.
  • a mobile relay station device mounted on a mobile body is used as a mobile radio station device to be moved, but this is just an example.
  • the mobile relay station device appearing below may be replaced with a mobile base station device, a mobile AP, or a mobile radio station device other than these.
  • moving XYZ means “XYZ” mounted on a moving body (eg, AGV, forklift).
  • the "moving XYZ” may be a device that itself has a moving means (eg, propeller + motor, tires + motor).
  • both the mobile relay station device and the base station device may be devices in a cellular communication network (e.g., 3G, 4G/LTE, 5G, 6G), or devices in a wireless LAN. , devices using communication methods other than these may be used. Further, communication between the mobile relay station device and the base station device may be performed by wireless LAN, and the base station device may be connected to a cellular communication network.
  • a cellular communication network e.g., 3G, 4G/LTE, 5G, 6G
  • devices using communication methods other than these may be used.
  • communication between the mobile relay station device and the base station device may be performed by wireless LAN, and the base station device may be connected to a cellular communication network.
  • FIG. 1 shows an example of the overall configuration of a wireless communication system in this embodiment.
  • this wireless communication system includes a plurality of terminal devices 20, a mobile relay station device 10, a base station device 30, and a control device 40. Although one mobile relay station device 10 and one base station device 30 are shown in FIG. 1, a plurality of each may be provided.
  • control device 40 is provided on the upper NW (network) 50.
  • control device 40 may be provided anywhere.
  • the control device 40 may be provided in any one of the terminal device 20, the mobile relay station device 10, and the base station device 30.
  • the terminal device 20 is a device that can communicate with both the relay station device 10 and the base station device 30 wirelessly.
  • the mobile relay station device 10 relays communication between the terminal device 20 and the base station device 30.
  • the base station device 10 transmits a signal received wirelessly from the terminal device 20 side to the upper NW 50, and transmits a signal received from the upper NW 50 wirelessly to the terminal device 20 side.
  • the relay function of the mobile relay station device 10 is ON/OFF controlled without controlling the movement of the mobile relay station device 10.
  • the mobile relay station device 10 appropriately performs relay between the base station device 30 and the terminal device 20.
  • the appropriate location can be set.
  • the mobile relay station device 10 By turning on the mobile relay station device 10 at , it becomes possible to appropriately perform communication between the terminal device 20 and the base station device 30 via the mobile relay station device 10.
  • control device 40 first provides an optimal position candidate area (also called a placement area) for the mobile relay station device 10 where the communication quality of the terminal device 20 satisfies the required quality. ) is calculated.
  • the control device 40 turns on the relay function of the mobile relay station device 10 whose stay time in the calculated optimal position candidate area is the maximum based on the scheduled or predicted movement route of each mobile relay station device 10. do.
  • Turning on the relay function of the mobile relay station device 10 may be rephrased as activating the wireless communication function of the mobile relay station device 10. As a result, the ON state can be maintained for a long time, and the frequency of ON/OFF switching can be reduced. An example of control will be explained below.
  • a situation is assumed in which a plurality of mobile relay station apparatuses 10 and a plurality of terminal apparatuses 20 exist in an area (target area) to be controlled by the control device 40. Further, there is a control device 40 that performs ON/OFF control of the mobile relay station device 10. Furthermore, there is a fixed base station device 30.
  • Each mobile relay station device 10 moves according to the purpose of the mobile body on which the relay station device is mounted. For example, if the mobile object is an AGV (automated guided vehicle) that transports things from one place A to another place B, the mobile relay station device 10 moves along the path between the places A and B.
  • AGV automated guided vehicle
  • mobile relay station apparatuses 10 passing through the optimum position candidate area include mobile relay station apparatuses 10-1, 10-2, and 10-3.
  • the control device 40 determines that the stay time of the mobile relay station device 10-1 is the longest among the stay times of the three mobile relay station devices 10 in the optimal position candidate area. Then, the relay function of the mobile relay station device 10-1 is turned on. For example, the control device 40 turns on the relay function of the mobile relay station device 10-1 when the mobile relay station device 10-1 enters the optimal position candidate area (or immediately before or after entering), and After the relay station device 10-1 leaves the optimum position candidate area, the relay function of the mobile relay station device 10-1 is turned off.
  • FIG. 3 shows one optimal position candidate area, there may be a plurality of optimal position candidate areas.
  • the control device 30 and the base station device 10 are connected by wire or wirelessly.
  • the base station device 30 and the mobile relay station device 10 are connected wirelessly, and the mobile relay station device 10 and the terminal device 20 are also connected wirelessly.
  • wireless communication between the mobile relay station device 10 and the terminal device 20 is performed only during the period when the mobile relay station device 10 has its relay function ON.
  • An instruction message to turn on (or turn off) the mobile relay station device 10 is transmitted from the control device 40 to the mobile relay station device 10.
  • the switching unit 11 of the mobile relay station device 10 receives the instruction message and turns on/off the relay function of the mobile relay station device 10 based on the instruction message.
  • the control device 40 includes an information acquisition section 41, an area calculation section 42, a selection section 43, and a control section 44.
  • the information acquisition unit 41 acquires information (movement schedule, movement schedule, history, etc.).
  • the information acquisition section 41 may include an environment grasping section (camera, sensor, etc.), and the environment grasping section may acquire information on the position of each terminal device 20 and obstacles.
  • the area calculation unit 42 calculates the optimal position candidate area by performing terminal clustering, etc., as described later.
  • the selection unit 43 selects the mobile relay station device 10 having the maximum staying time in the optimum position candidate area.
  • the control unit 44 performs ON/OFF control on the selected mobile relay station device 10.
  • the information acquisition unit 41, the area calculation unit 42, the selection unit 43, and the control unit 44 may be provided in any device within the wireless communication system.
  • the control device 40 may include the information acquisition section 41
  • the base station device 30 may include the area calculation section 42, the selection section 43, and the control section 44.
  • Any device including the area calculation unit 42 and the selection unit 43 may be referred to as a “control device”.
  • the information acquisition unit 41 acquires information (movement schedule, travel history, etc.).
  • the region calculation unit 42 calculates one or more optimal position candidate regions.
  • the method for calculating the optimal position candidate area is not limited to a specific method, for example, calculation method example 1 or calculation method example 2 below can be used.
  • the antenna of mobile relay station device 10 is an omnidirectional antenna.
  • the antenna of the base station device 10 is a directional antenna (an antenna whose direction can be changed), for example, in the calculation of the predicted communication quality below, when the antenna is directed in the direction where the predicted communication quality is the best. What is necessary is to calculate the predicted communication quality.
  • the area calculation unit 42 first performs terminal clustering on a plurality of terminal devices 20 within the target area by randomly changing the terminal clustering initial value using the k-means method. Specifically, for example, a terminal clustering initial value is set for the number of target mobile relay station apparatuses 10 (assumed to be M), and the plurality of terminal apparatuses 20 are divided into M clusters. Such clustering is performed multiple times by randomly changing the terminal clustering initial value. Note that clustering may be performed using hierarchical clustering.
  • the area calculation unit 42 moves the mobile relay station device 10 to a predetermined position within each cluster (on the computer), and determines that the predicted communication quality after the movement (predicted communication quality at the terminal device 20) is equal to or higher than a predetermined value. Obtain a position candidate. In other words, position candidates for each mobile relay station device 10 whose communication with the terminal device 20 satisfies the required quality are calculated. Note that the quality to be evaluated may be the quality of communication between the mobile relay station device 10 and the terminal device 20, or the quality of communication between the base station device 30 and the terminal device 20. Good too.
  • the area that includes the above position candidates is defined as the optimal position candidate area.
  • the shape and size of the region may be that of a cluster, or may be a predetermined shape and size.
  • the predetermined position within a cluster is, for example, the center of gravity of the cluster.
  • the predetermined position may be the closest position to the center of gravity among the positions within the cluster where the base station apparatus 30 can be seen.
  • each mobile relay station device 10 may move to a position (route) where it can see through the base station device 30.
  • the mobile relay station device 10 when moving the mobile relay station device 10 to a predetermined position within a cluster (on a computer), the mobile relay station device 10 may be any one mobile relay station device 10, or within the cluster. It may be a specific mobile relay station device 10 that can move.
  • clusters through which the mobile relay station device 10 does not pass at all may be excluded from targets for calculating position candidates.
  • the method of calculating the predicted communication quality is not limited to a specific method, but for example, the line-of-sight area ratio, the predicted throughput integrated value, or the rate of terminals achieving the required quality can be used.
  • the line-of-sight area ratio refers to the terminal device 20 that can see through the mobile relay station device 10 from the terminal device 20 (that is, there are no obstacles between the terminal device 20 and the mobile relay station device 10) out of the area of the target area. is the area ratio of the area where . For example, by dividing the target area into mesh areas, the area of the area where the terminal device 20 exists such that the mobile relay station device 10 can be seen from the terminal device 20 can be determined.
  • the predicted throughput integrated value is a value obtained by integrating (totaling) the predicted throughput at the terminal device 20 for all the terminal devices 20 in the cluster of the mobile relay station device 10.
  • the throughput can be estimated from the received power of the signal from the mobile relay station device 10 at the terminal device 20.
  • the ratio of terminals achieving the required quality is the ratio of the terminals 20 that have achieved the required quality among all the terminals 20 in the cluster of the mobile relay station device 10.
  • the required quality is, for example, throughput. As described above, the throughput can be estimated from the received power, so by comparing the estimated throughput and the required quality, it can be determined for each terminal device 20 whether the required quality is achieved.
  • performing terminal clustering as in calculation method example 1 has the effect of reducing the amount of calculation. If clustering is not performed, the path loss between each mobile relay station device and all terminal devices in the target area is calculated for all combinations of mobile relay station device placements as explained in calculation method example 2, and the terminal point Since the reception quality is determined at , the amount of calculation becomes large depending on the conditions. On the other hand, by performing terminal clustering, it is possible to obtain position candidates while reducing the amount of calculation by calculating the path loss between the terminal devices included in each cluster and the corresponding mobile relay station device 10. can.
  • Calculation method example 2 The area calculation unit 42 calculates predicted communication quality for all position candidates that each mobile relay station device 10 can take, obtains position candidates whose predicted communication quality is equal to or higher than a predetermined value, and includes the position candidates. Let the area be the optimal position candidate area. An example of the method for calculating predicted communication quality is as described above.
  • the selection unit 43 predicts the movement of each mobile relay station device 10 (predicts when and in what position it will be located), and selects a mobile relay that maximizes the stay time in the optimal location candidate region for each optimal location candidate region. Select the station device 10.
  • the selection unit 43 determines that the mobile relay station device 10-1 is to When the mobile relay station device 10-2 detects that the mobile relay station device 10-2 will stay from 11:00 to 11:30, it sets the mobile relay station device 10-1 as an ON control target for the optimum position candidate area. select.
  • Any method may be used to predict the movement of each mobile relay station device 10. For example, predicted values based on machine learning or the like may be used, or in the case of a factory or the like, movement prediction may be performed by obtaining a movement schedule from a control program for a mobile body carrying the mobile relay station device 10.
  • control unit 44 executes ON/OFF control for the mobile relay station device 10 based on the selection result in S103. Specifically, the control unit 44 instructs the mobile relay station device 10 to turn on or off the relay function using a predetermined message.
  • the control unit 44 controls the mobile relay station apparatus 10-1 to enter the optimum position candidate area.
  • it detects that it is 11:00 (or when it detects that it is 11:00) it executes control to turn on the relay function of the mobile relay station device 10-1.
  • the terminal device 20, mobile relay station device 10, base station device 30, and control device 40 can all be realized, for example, by causing a computer to execute a program.
  • This computer may be a physical computer or a virtual machine on the cloud.
  • the "terminal device 20, mobile relay station device 10, base station device 30, and control device 40" will be collectively referred to as the "device.”
  • the device can be realized by using hardware resources such as a CPU and memory built into a computer to execute a program corresponding to the processing performed by the device.
  • the above program can be recorded on a computer-readable recording medium (such as a portable memory) and can be stored or distributed. It is also possible to provide the above program through a network such as the Internet or e-mail.
  • FIG. 6 is a diagram showing an example of the hardware configuration of the computer.
  • the computer in FIG. 6 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, etc., which are interconnected by a bus BS.
  • a program that realizes processing on the computer is provided, for example, on a recording medium 1001 such as a CD-ROM or a memory card.
  • a recording medium 1001 such as a CD-ROM or a memory card.
  • the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000.
  • the program does not necessarily need to be installed from the recording medium 1001, and may be downloaded from another computer via a network.
  • the auxiliary storage device 1002 stores installed programs as well as necessary files, data, and the like.
  • the memory device 1003 reads and stores the program from the auxiliary storage device 1002 when there is an instruction to start the program.
  • the CPU 1004 implements functions related to the device according to programs stored in the memory device 1003.
  • the interface device 1005 is used as an interface for connecting to a network or the like.
  • a display device 1006 displays a GUI (Graphical User Interface) and the like based on a program.
  • the input device 1007 is composed of a keyboard, a mouse, buttons, a touch panel, or the like, and is used to input various operation instructions.
  • An output device 1008 outputs the calculation result. Note that any or all of the display device 1006, input device 1007, and output device 1008 may not be provided.
  • the technology according to the present embodiment can reduce the frequency of ON/OFF control of the mobile relay station device 10, so it is possible to avoid momentary communication interruptions due to connection changes and bandwidth compression due to messaging. It becomes possible.
  • a wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices, memory and at least one processor connected to the memory; including;
  • the processor includes: Calculate the placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality, Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area, A wireless communication system that operates the wireless communication functions of selected mobile radio station equipment.
  • the wireless communication system according to supplementary note 1, wherein the processor calculates the placement area by performing clustering on terminal devices.
  • Each mobile radio station device is a relay station device that relays communication between a base station device and a terminal device, and is a relay station device mounted on a mobile body.
  • Wireless communication according to supplementary note 1 or 2. system.
  • the control device in a wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices and a control device, memory and at least one processor connected to the memory; including;
  • the processor includes: Calculate the placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality, Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area, A control device that operates a wireless communication function of a mobile radio station device selected by the selection unit.
  • a control method executed by a computer in a wireless communication system comprising one or more mobile radio station devices communicating with one or more terminal devices, the method comprising: Calculate a placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality, Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area, A control method for operating the wireless communication function of a selected mobile radio station device.

Abstract

This wireless communication system comprises one or more mobile wireless station devices that communicate with one or more terminal devices, and comprises: a region calculation unit that calculates a placement region encompassing the position of a mobile wireless station device such that the communication quality of a terminal device satisfies a required quality; a selection unit that selects, on the basis of movement prediction for each of the mobile wireless station devices, a mobile wireless station device that has the greatest dwell time in the placement region; and a control unit that activates the wireless communication function of the mobile wireless station device selected by the selection unit.

Description

無線通信システム、制御装置、及び制御方法Wireless communication system, control device, and control method
　本発明は、移動中継局装置等の移動無線局装置に対するＯＮ／ＯＦＦ制御を行う技術に関連するものである。 The present invention relates to a technique for performing ON/OFF control on a mobile radio station device such as a mobile relay station device.
　５Ｇや無線ＬＡＮ等の無線通信技術が広く普及している。近年では、非特許文献１に開示されているように、工場内等を移動する移動体（フォークリフト等）に中継局装置を搭載し、必要に応じて中継機能のＯＮ／ＯＦＦ制御をすることでエリア品質の改善を図る技術が提案されている。 Wireless communication technologies such as 5G and wireless LAN are becoming widespread. In recent years, as disclosed in Non-Patent Document 1, a relay station device is mounted on a moving object (forklift, etc.) that moves within a factory, etc., and the relay function is turned on/off as necessary. Techniques have been proposed to improve area quality.
　このような技術により、ユーザに無線ネットワークを意識させないナチュラルな通信環境を提供することが期待される。移動体に搭載された中継局装置を移動中継局装置と呼ぶ。 It is expected that such technology will provide a natural communication environment that does not make users aware of the wireless network. A relay station device mounted on a mobile body is called a mobile relay station device.
　非特許文献１に開示された技術に基づいて、移動中継局装置のＯＮ／ＯＦＦ制御により、適切な通信を行うためには、最適位置に近い移動中継局装置をＯＮ状態にして使用する必要がある。 Based on the technology disclosed in Non-Patent Document 1, in order to perform appropriate communication by ON/OFF control of the mobile relay station device, it is necessary to use the mobile relay station device close to the optimal position in the ON state. be.
　しかし、従来技術では、移動中継局装置の移動状況によってはＯＮ／ＯＦＦの切り替えが頻発し、接続替えによる瞬間的な通信断が発生したり、メッセージングによるオーバーヘッドが帯域を圧迫したりする可能性があった。このような課題は、移動中継局装置に限定されない移動無線局装置において生じ得る課題である。 However, with conventional technology, depending on the movement status of the mobile relay station device, ON/OFF switching occurs frequently, and there is a possibility that instantaneous communication interruptions may occur due to connection changes, and that overhead due to messaging may compress the bandwidth. there were. Such a problem is a problem that can occur in mobile radio station devices, not limited to mobile relay station devices.
　本発明は上記の点に鑑みてなされたものであり、移動無線局装置に対するＯＮ／ＯＦＦ制御を行う技術において、ＯＮ／ＯＦＦの切り替え頻度を低減させるための技術を提供することを目的とする。 The present invention has been made in view of the above points, and an object of the present invention is to provide a technology for reducing the frequency of ON/OFF switching in a technology for performing ON/OFF control of a mobile radio station device.
　開示の技術によれば、１以上の端末装置との通信を行う１以上の移動無線局装置を備える無線通信システムであって、
　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算出する領域計算部と、
　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択する選択部と、
　前記選択部により選択された移動無線局装置の無線通信機能を稼働させる制御部と
　を備える無線通信システムが提供される。 According to the disclosed technology, a wireless communication system includes one or more mobile radio station devices that communicate with one or more terminal devices,
an area calculation unit that calculates a placement area that includes the location of the mobile radio station device in which the communication quality of the terminal device satisfies the required quality;
a selection unit that selects a mobile radio station device with a maximum residence time in the placement area based on a movement prediction of each mobile radio station device;
A wireless communication system is provided, comprising: a control unit that operates a wireless communication function of a mobile radio station device selected by the selection unit.
　開示の技術によれば、移動無線局装置に対するＯＮ／ＯＦＦ制御を行う技術において、ＯＮ／ＯＦＦの切り替え頻度を低減させることが可能となる。 According to the disclosed technology, it is possible to reduce the frequency of ON/OFF switching in a technology that performs ON/OFF control for a mobile radio station device.
無線通信システムの全体構成例を示す図である。1 is a diagram showing an example of the overall configuration of a wireless communication system. 無線通信システムの全体構成例を示す図である。1 is a diagram showing an example of the overall configuration of a wireless communication system. 動作概要を説明するための図である。FIG. 3 is a diagram for explaining an outline of the operation. 装置構成例を示す図である。FIG. 2 is a diagram showing an example of a device configuration. 動作を説明するためのフローチャートである。It is a flowchart for explaining operation. 装置のハードウェア構成例を示す図である。It is a diagram showing an example of the hardware configuration of the device.
　以下、図面を参照して本発明の実施の形態（本実施の形態）を説明する。以下で説明する実施の形態は一例に過ぎず、本発明が適用される実施の形態は、以下の実施の形態に限られるわけではない。 Hereinafter, an embodiment of the present invention (this embodiment) will be described with reference to the drawings. The embodiments described below are merely examples, and embodiments to which the present invention is applied are not limited to the following embodiments.
　以下の実施の形態の説明では、移動の対象とする移動無線局装置として、移動体に搭載された移動中継局装置を使用しているが、これは一例である。以下で登場する移動中継局装置を、移動基地局装置に置き換えてもよいし、移動ＡＰに置き換えてもよいし、これら以外の移動無線局装置に置き換えてもよい。なお、「移動ＸＹＺ」は、移動体（例：ＡＧＶ、フォークリフト）に搭載された「ＸＹＺ」を意味する。ただし、「移動ＸＹＺ」は、その装置自身が移動手段（例：プロペラ＋モータ、タイヤ＋モータ）を持つ装置であってもよい。 In the following description of the embodiment, a mobile relay station device mounted on a mobile body is used as a mobile radio station device to be moved, but this is just an example. The mobile relay station device appearing below may be replaced with a mobile base station device, a mobile AP, or a mobile radio station device other than these. Note that "moving XYZ" means "XYZ" mounted on a moving body (eg, AGV, forklift). However, the "moving XYZ" may be a device that itself has a moving means (eg, propeller + motor, tires + motor).
　また、移動中継局装置と基地局装置はいずれも、セルラ通信網（例：３Ｇ、４Ｇ／ＬＴＥ、５Ｇ、６Ｇ）における装置であってもよいし、無線ＬＡＮでの装置であってもよいし、これら以外の通信方式における装置であってもよい。また、移動中継局装置と基地局装置との間の通信を無線ＬＡＮで行い、基地局装置はセルラ通信網に接続されることとしてもよい。 Furthermore, both the mobile relay station device and the base station device may be devices in a cellular communication network (e.g., 3G, 4G/LTE, 5G, 6G), or devices in a wireless LAN. , devices using communication methods other than these may be used. Further, communication between the mobile relay station device and the base station device may be performed by wireless LAN, and the base station device may be connected to a cellular communication network.
　（システムの全体構成例）
　図１に、本実施の形態における無線通信システムの全体構成例を示す。図１に示すように、本無線通信システムは、複数の端末装置２０、移動中継局装置１０、基地局装置３０、及び制御装置４０を有する。図１には、１つの移動中継局装置１０と１つの基地局装置３０が示されているが、それぞれ複数台が備えられてもよい。 (Example of overall system configuration)
FIG. 1 shows an example of the overall configuration of a wireless communication system in this embodiment. As shown in FIG. 1, this wireless communication system includes a plurality of terminal devices 20, a mobile relay station device 10, a base station device 30, and a control device 40. Although one mobile relay station device 10 and one base station device 30 are shown in FIG. 1, a plurality of each may be provided.
　図１に示す例では、制御装置４０が、上位ＮＷ（ネットワーク）５０上に備えられている。ただし、制御装置４０は、どこに備えられてもよい。例えば、制御装置４０が、端末装置２０、移動中継局装置１０、及び基地局装置３０のうちのいずれかの装置に備えられてもよい。 In the example shown in FIG. 1, the control device 40 is provided on the upper NW (network) 50. However, the control device 40 may be provided anywhere. For example, the control device 40 may be provided in any one of the terminal device 20, the mobile relay station device 10, and the base station device 30.
　端末装置２０は、無線により中継局装置１０と基地局装置３０のいずれとも通信可能な装置である。移動中継局装置１０は、端末装置２０と基地局装置３０との間の通信の中継を行う。基地局装置１０は、端末装置２０側から無線で受信した信号を上位ＮＷ５０に送信し、上位ＮＷ５０から受信した信号を無線で端末装置２０側へ送信する。 The terminal device 20 is a device that can communicate with both the relay station device 10 and the base station device 30 wirelessly. The mobile relay station device 10 relays communication between the terminal device 20 and the base station device 30. The base station device 10 transmits a signal received wirelessly from the terminal device 20 side to the upper NW 50, and transmits a signal received from the upper NW 50 wirelessly to the terminal device 20 side.
　上位ＮＷ５０は、モバイル網（例：５Ｇ）のコアネットワークであってもよいし、インターネットであってもよいし、これら以外のネットワークであってもよい。制御装置４０は、情報収集や制御等の動作を行う。 The upper NW 50 may be a core network of a mobile network (eg, 5G), the Internet, or a network other than these. The control device 40 performs operations such as information collection and control.
　（動作概要）
　本実施の形態では、基本的には非特許文献１に開示されているように、移動中継局装置１０の移動を制御せずに、移動中継局装置１０の中継機能のＯＮ／ＯＦＦ制御により、移動中継局装置１０が、基地局装置３０と端末装置２０との間の中継を適切に行うようにしている。 (Operation overview)
In this embodiment, basically, as disclosed in Non-Patent Document 1, the relay function of the mobile relay station device 10 is ON/OFF controlled without controlling the movement of the mobile relay station device 10. The mobile relay station device 10 appropriately performs relay between the base station device 30 and the terminal device 20.
　これにより、例えば、障害物により端末装置２０と基地局装置３０との間の見通しが遮断されている場合や、端末装置２０と基地局装置３０との間の距離が長い場合でも、適切な場所で移動中継局装置１０をＯＮすることにより、移動中継局装置１０を介して、端末装置２０と基地局装置３０との間の通信を適切に行うことが可能となる。 As a result, even if the line of sight between the terminal device 20 and the base station device 30 is blocked by an obstacle, or if the distance between the terminal device 20 and the base station device 30 is long, the appropriate location can be set. By turning on the mobile relay station device 10 at , it becomes possible to appropriately perform communication between the terminal device 20 and the base station device 30 via the mobile relay station device 10.
　移動中継局装置１０が適切な中継を行うためには、最適位置に近い移動中継局装置１０をＯＮ状態にして使用する必要がある。前述したように、このとき移動中継局装置１０の移動状況によってはＯＮ／ＯＦＦの切り替えが頻発し、接続替えによる瞬間的な通信断が発生したり、メッセージングによるオーバーヘッドが帯域を圧迫したりする可能性がある。 In order for the mobile relay station device 10 to perform appropriate relaying, it is necessary to turn on the mobile relay station device 10 near the optimal position and use it. As mentioned above, at this time, depending on the movement status of the mobile relay station device 10, ON/OFF switching may occur frequently, causing instantaneous communication interruptions due to connection changes, and overhead due to messaging may compress the bandwidth. There is sex.
　本実施の形態では、上記の課題を解決するために、制御装置４０は、ます、端末装置２０の通信品質が所要品質を満たす移動中継局装置１０の最適位置候補領域（配置領域と呼んでもよい）を算出する。 In the present embodiment, in order to solve the above problems, the control device 40 first provides an optimal position candidate area (also called a placement area) for the mobile relay station device 10 where the communication quality of the terminal device 20 satisfies the required quality. ) is calculated.
　そして、制御装置４０は、各移動中継局装置１０の予定又は予測された移動経路に基づいて、算出された最適位置候補領域における滞在時間が最大である移動中継局装置１０の中継機能をＯＮにする。移動中継局装置１０の中継機能をＯＮにすることを、移動中継局装置１０の無線通信機能を稼働させる、と言い換えてもよい。これにより、ＯＮ状態の時間を長く保つことができ、ＯＮ／ＯＦＦに切り替え頻度を削減できる。以下、制御の例を説明する。 Then, the control device 40 turns on the relay function of the mobile relay station device 10 whose stay time in the calculated optimal position candidate area is the maximum based on the scheduled or predicted movement route of each mobile relay station device 10. do. Turning on the relay function of the mobile relay station device 10 may be rephrased as activating the wireless communication function of the mobile relay station device 10. As a result, the ON state can be maintained for a long time, and the frequency of ON/OFF switching can be reduced. An example of control will be explained below.
　ここでは、例えば図２に示すように、制御装置４０の制御の対象となるエリア（対象エリア）において、複数の移動中継局装置１０と複数の端末装置２０が存在する状況を想定する。また、移動中継局装置１０のＯＮ／ＯＦＦ制御を行う制御装置４０が存在する。また、固定された基地局装置３０が存在する。 Here, for example, as shown in FIG. 2, a situation is assumed in which a plurality of mobile relay station apparatuses 10 and a plurality of terminal apparatuses 20 exist in an area (target area) to be controlled by the control device 40. Further, there is a control device 40 that performs ON/OFF control of the mobile relay station device 10. Furthermore, there is a fixed base station device 30.
　各移動中継局装置１０は、中継局装置を搭載している移動体の目的に従って移動する。例えば、移動体が、物をある場所Ａから別の場所Ｂへ運ぶＡＧＶ（無人搬送車）である場合、移動中継局装置１０は、場所Ａと場所Ｂとの間の通路を移動する。 Each mobile relay station device 10 moves according to the purpose of the mobile body on which the relay station device is mounted. For example, if the mobile object is an AGV (automated guided vehicle) that transports things from one place A to another place B, the mobile relay station device 10 moves along the path between the places A and B.
　制御装置４０が、図３において斜線で示している領域を最適位置候補領域として算出したとする。ここでは、最適位置候補領域内を通る移動中継局装置１０として、移動中継局装置１０－１、１０－２、１０－３がある。 Assume that the control device 40 calculates the shaded area in FIG. 3 as the optimal position candidate area. Here, mobile relay station apparatuses 10 passing through the optimum position candidate area include mobile relay station apparatuses 10-1, 10-2, and 10-3.
　制御装置４０は、各移動中継局装置１０の移動予測に基づき、３つの移動中継局装置１０による最適位置候補領域の滞在時間うち、移動中継局装置１０－１の滞在時間が最長であると判断し、移動中継局装置１０－１の中継機能をＯＮにする。例えば、制御装置４０は、移動中継局装置１０－１が最適位置候補領域に入ったとき（あるいは、入る直前、入った直後）に移動中継局装置１０－１の中継機能をＯＮにして、移動中継局装置１０－１が最適位置候補領域から出た後に移動中継局装置１０－１の中継機能をＯＦＦにする。 Based on the movement prediction of each mobile relay station device 10, the control device 40 determines that the stay time of the mobile relay station device 10-1 is the longest among the stay times of the three mobile relay station devices 10 in the optimal position candidate area. Then, the relay function of the mobile relay station device 10-1 is turned on. For example, the control device 40 turns on the relay function of the mobile relay station device 10-1 when the mobile relay station device 10-1 enters the optimal position candidate area (or immediately before or after entering), and After the relay station device 10-1 leaves the optimum position candidate area, the relay function of the mobile relay station device 10-1 is turned off.
　なお、図３の例では１つの最適位置候補領域を示しているが、最適位置候補領域は複数個あってもよい。 Note that although the example in FIG. 3 shows one optimal position candidate area, there may be a plurality of optimal position candidate areas.
　（装置構成例）
　図４に、本実施の形態に係る無線通信システムを構成する装置の構成例（特に制御装置４０の構成例）を示す。図４に示すように、本無線通信システムは、制御装置４０、基地局装置３０、移動中継局装置１０、及び端末装置２０を有する。 (Example of device configuration)
FIG. 4 shows a configuration example of devices (particularly a configuration example of the control device 40) constituting the wireless communication system according to the present embodiment. As shown in FIG. 4, this wireless communication system includes a control device 40, a base station device 30, a mobile relay station device 10, and a terminal device 20.
　制御装置３０と基地局装置１０との間は有線又は無線により接続される。基地局装置３０と移動中継局装置１０との間は無線で接続され、移動中継局装置１０と端末装置２０との間も無線で接続される。ただし、移動中継局装置１０と端末装置２０との間の無線通信については、移動中継局装置１０が中継機能をＯＮにしている期間のみで行われる。 The control device 30 and the base station device 10 are connected by wire or wirelessly. The base station device 30 and the mobile relay station device 10 are connected wirelessly, and the mobile relay station device 10 and the terminal device 20 are also connected wirelessly. However, wireless communication between the mobile relay station device 10 and the terminal device 20 is performed only during the period when the mobile relay station device 10 has its relay function ON.
　制御装置４０から移動中継局装置１０に対して、移動中継局装置１０をＯＮ（又はＯＦＦ）にする指示メッセージが送信される。移動中継局装置１０の切り替え部１１が当該指示メッセージを受信し、当該指示メッセージに基づいて、移動中継局装置１０の中継機能をＯＮ／ＯＦＦする。 An instruction message to turn on (or turn off) the mobile relay station device 10 is transmitted from the control device 40 to the mobile relay station device 10. The switching unit 11 of the mobile relay station device 10 receives the instruction message and turns on/off the relay function of the mobile relay station device 10 based on the instruction message.
　図４に示すように、制御装置４０は、情報取得部４１、領域計算部４２、選択部４３、制御部４４を備える。 As shown in FIG. 4, the control device 40 includes an information acquisition section 41, an area calculation section 42, a selection section 43, and a control section 44.
　情報取得部４１は、対象エリアにおける各端末装置２０の位置、遮蔽物の情報（位置と形状等）、各移動中継局装置１０の位置（あるいは経路）の予測に必要な情報（移動予定、移動履歴など）を取得する。情報取得部４１が、環境把握部（カメラ、センサなど）を備え、環境把握部により各端末装置２０の位置や遮蔽物の情報を取得してもよい。 The information acquisition unit 41 acquires information (movement schedule, movement schedule, history, etc.). The information acquisition section 41 may include an environment grasping section (camera, sensor, etc.), and the environment grasping section may acquire information on the position of each terminal device 20 and obstacles.
　領域計算部４２は、後述するように、端末クラスタリング等を行うことで、最適位置候補領域を算出する。選択部４３は、最適位置候補領域における滞在時間が最大となる移動中継局装置１０を選択する。制御部４４は、選択した移動中継局装置１０に対するＯＮ／ＯＦＦ制御を行う。 The area calculation unit 42 calculates the optimal position candidate area by performing terminal clustering, etc., as described later. The selection unit 43 selects the mobile relay station device 10 having the maximum staying time in the optimum position candidate area. The control unit 44 performs ON/OFF control on the selected mobile relay station device 10.
　なお、図４のような機能配置は一例である。情報取得部４１、領域計算部４２、選択部４３、制御部４４はそれぞれ無線通信システム内のどの装置に備えられてもよい。例えば、制御装置４０が、情報取得部４１を備え、基地局装置３０が、領域計算部４２、選択部４３、制御部４４を備えてもよい。領域計算部４２と選択部４３を含むいずれの装置についてもそれを「制御装置」と呼んでもよい。 Note that the functional arrangement as shown in FIG. 4 is an example. The information acquisition unit 41, the area calculation unit 42, the selection unit 43, and the control unit 44 may be provided in any device within the wireless communication system. For example, the control device 40 may include the information acquisition section 41, and the base station device 30 may include the area calculation section 42, the selection section 43, and the control section 44. Any device including the area calculation unit 42 and the selection unit 43 may be referred to as a “control device”.
　（動作例）
　次に、制御装置４０の動作について、図５のフローチャートの手順に沿って説明する。 (Operation example)
Next, the operation of the control device 40 will be explained according to the procedure of the flowchart in FIG.
　＜Ｓ１０１＞
　Ｓ１０１において、情報取得部４１が、対象エリアにおける各端末装置２０の位置、遮蔽物の情報（位置と形状等）、各移動中継局装置１０の位置（あるいは経路）の予測に必要な情報（移動予定、移動履歴など）を取得する。 <S101>
In S101, the information acquisition unit 41 acquires information (movement schedule, travel history, etc.).
　＜Ｓ１０２＞
　Ｓ１０２において、領域計算部４２が、１つ又は複数の最適位置候補領域を算出する。最適位置候補領域の算出方法は特定の方法に限られないが、例えば、下記の算出方法例１あるいは算出方法例２を使用することができる。 <S102>
In S102, the region calculation unit 42 calculates one or more optimal position candidate regions. Although the method for calculating the optimal position candidate area is not limited to a specific method, for example, calculation method example 1 or calculation method example 2 below can be used.
　なお、以下の算出方法例１、算出方法例２では、移動中継局装置１０のアンテナが、無指向性アンテナである場合を想定している。基地局装置１０のアンテナが、指向性を持つアンテナの場合（方向を変えられるアンテナの場合）、例えば、下記の予測通信品質の計算において、予測通信品質が最も良くなる方向にアンテナを向けた場合の予測通信品質を算出すればよい。 Note that in calculation method example 1 and calculation method example 2 below, it is assumed that the antenna of mobile relay station device 10 is an omnidirectional antenna. When the antenna of the base station device 10 is a directional antenna (an antenna whose direction can be changed), for example, in the calculation of the predicted communication quality below, when the antenna is directed in the direction where the predicted communication quality is the best. What is necessary is to calculate the predicted communication quality.
　算出方法例１：
　領域計算部４２は、まず、対象エリア内の複数の端末装置２０に対し、端末クラスタリング初期値をランダムに変化させて、ｋ－ｍｅａｎｓ法で端末クラスタリングを行う。具体的には、例えば、対象の移動中継局装置１０の数（Ｍとする）の端末クラスタリング初期値を設定し、複数の端末装置２０をＭ個のクラスタに分ける。このようなクラスタリングを、端末クラスタリング初期値をランダムに変化させて、複数回実施する。なお、階層型クラスタリングを用いて、クラスタリングを行ってもよい。 Calculation method example 1:
The area calculation unit 42 first performs terminal clustering on a plurality of terminal devices 20 within the target area by randomly changing the terminal clustering initial value using the k-means method. Specifically, for example, a terminal clustering initial value is set for the number of target mobile relay station apparatuses 10 (assumed to be M), and the plurality of terminal apparatuses 20 are divided into M clusters. Such clustering is performed multiple times by randomly changing the terminal clustering initial value. Note that clustering may be performed using hierarchical clustering.
　領域計算部４２は、各クラスタ内の所定位置に移動中継局装置１０を（コンピュータ上で）移動させ、移動後の予測通信品質（端末装置２０での予測通信品質）が予め定めた値以上となる位置候補を得る。つまり、端末装置２０との通信が所要品質を満たす各移動中継局装置１０の位置候補を算出する。なお、評価対象とする品質は、移動中継局装置１０と端末装置２０との間の通信の品質であってもよいし、基地局装置３０と端末装置２０との間の通信の品質であってもよい。 The area calculation unit 42 moves the mobile relay station device 10 to a predetermined position within each cluster (on the computer), and determines that the predicted communication quality after the movement (predicted communication quality at the terminal device 20) is equal to or higher than a predetermined value. Obtain a position candidate. In other words, position candidates for each mobile relay station device 10 whose communication with the terminal device 20 satisfies the required quality are calculated. Note that the quality to be evaluated may be the quality of communication between the mobile relay station device 10 and the terminal device 20, or the quality of communication between the base station device 30 and the terminal device 20. Good too.
　上記の位置候補を包含する領域を最適位置候補領域とする。領域の形状及び大きさはクラスタの形状及び大きさとしてもよいし、予め定めた形状及び大きさとしてもよい。 The area that includes the above position candidates is defined as the optimal position candidate area. The shape and size of the region may be that of a cluster, or may be a predetermined shape and size.
　ここで、クラスタ内の所定位置とは、例えば、そのクラスタの重心位置である。あるいは、重心位置から基地局装置３０を見通すことができない場合、所定位置は、クラスタ内の、基地局装置３０を見通すことができる位置のうち、重心位置に最も近い位置であってもよい。また、本実施の形態において、各移動中継局装置１０は、基地局装置３０を見通すことができる位置（経路）を移動することとしてもよい。 Here, the predetermined position within a cluster is, for example, the center of gravity of the cluster. Alternatively, if the base station apparatus 30 cannot be seen from the center of gravity, the predetermined position may be the closest position to the center of gravity among the positions within the cluster where the base station apparatus 30 can be seen. Furthermore, in the present embodiment, each mobile relay station device 10 may move to a position (route) where it can see through the base station device 30.
　また、クラスタ内の所定位置に移動中継局装置１０を（コンピュータ上で）移動させる場合のその移動中継局装置１０は、任意の１つの移動中継局装置１０であってもよいし、そのクラスタ内を移動し得る特定の移動中継局装置１０であってもよい。 Further, when moving the mobile relay station device 10 to a predetermined position within a cluster (on a computer), the mobile relay station device 10 may be any one mobile relay station device 10, or within the cluster. It may be a specific mobile relay station device 10 that can move.
　また、クラスタリングした結果により得られた複数のクラスタのうち、移動中継局装置１０が全く通過しないクラスタは、位置候補を算出する対象から除いてもよい。 Furthermore, among the plurality of clusters obtained as a result of clustering, clusters through which the mobile relay station device 10 does not pass at all may be excluded from targets for calculating position candidates.
　例えば、３つの移動中継局装置１０について、初期値を変えた２回のクラスタリングに基づく移動中継局装置１０の位置（クラスタ内の所定位置）として、（Ｐ１１，Ｐ１２，Ｐ１３）と（Ｐ２１，Ｐ２２，Ｐ２３）が得られたとする。 For example, for three mobile relay station devices 10, (P11, P12, P13) and (P21, P22) are the positions (predetermined positions within the cluster) of the mobile relay station devices 10 based on two clusterings with different initial values. , P23) is obtained.
　ここで、予測通信品質による評価を行った結果、（Ｐ１１，Ｐ１２，Ｐ１３）のうちＰ１１のみ所要品質を満たし、（Ｐ２１，Ｐ２２，Ｐ２３）ではＰ２１とＰ２２が所要品質を満たしたとすると、クラスタリング結果として（Ｐ２１，Ｐ２２，Ｐ２３）を選択し、Ｐ２１の領域とＰ２２の領域をそれぞれ最適位置候補領域とする。ただし、このような処理方法は一例である。 Here, as a result of evaluating the predicted communication quality, if only P11 among (P11, P12, P13) satisfies the required quality, and among (P21, P22, P23), P21 and P22 satisfy the required quality, then the clustering result (P21, P22, P23) are selected, and the area of P21 and the area of P22 are respectively set as optimal position candidate areas. However, such a processing method is only an example.
　予測通信品質の計算方法については、特定の方法に限定されないが、例えば、見通し面積率、予測スループット積算値、あるいは、要求品質達成端末率を用いることができる。 The method of calculating the predicted communication quality is not limited to a specific method, but for example, the line-of-sight area ratio, the predicted throughput integrated value, or the rate of terminals achieving the required quality can be used.
　見通し面積率とは、対象エリアの面積のうち、端末装置２０から移動中継局装置１０を見通せる（つまり、端末装置２０と移動中継局装置１０との間に障害物がない）ような端末装置２０が存在するエリアの面積の割合である。例えば、対象エリアをメッシュエリアに分割することで、端末装置２０から移動中継局装置１０を見通せるような端末装置２０が存在するエリアの面積を求めることができる。 The line-of-sight area ratio refers to the terminal device 20 that can see through the mobile relay station device 10 from the terminal device 20 (that is, there are no obstacles between the terminal device 20 and the mobile relay station device 10) out of the area of the target area. is the area ratio of the area where . For example, by dividing the target area into mesh areas, the area of the area where the terminal device 20 exists such that the mobile relay station device 10 can be seen from the terminal device 20 can be determined.
　予測スループット積算値とは、端末装置２０における予測スループットを、移動中継局装置１０のクラスタ内の全ての端末装置２０で積算（総和）した値である。スループットは、端末装置２０における移動中継局装置１０からの信号の受信電力から推定することができる。 The predicted throughput integrated value is a value obtained by integrating (totaling) the predicted throughput at the terminal device 20 for all the terminal devices 20 in the cluster of the mobile relay station device 10. The throughput can be estimated from the received power of the signal from the mobile relay station device 10 at the terminal device 20.
　要求品質達成端末率とは、移動中継局装置１０のクラスタ内の全ての端末装置２０のうち、要求品質を達成している端末装置２０の割合である。要求品質は例えばスループットである。上記のようにスループットは受信電力から推定できるので、推定したスループットと要求品質を比較することで、端末装置２０毎に、要求品質を達成しているか否かを判断できる。 The ratio of terminals achieving the required quality is the ratio of the terminals 20 that have achieved the required quality among all the terminals 20 in the cluster of the mobile relay station device 10. The required quality is, for example, throughput. As described above, the throughput can be estimated from the received power, so by comparing the estimated throughput and the required quality, it can be determined for each terminal device 20 whether the required quality is achieved.
　なお、算出方法例１のように、端末クラスタリングを行うことで、計算量を削減できるという効果がある。クラスタリングを行わない場合、算出方法例２で説明するように移動中継局装置配置の全組み合わせにおいて、各移動中継局装置と対象エリアの全端末装置との間のパスロス等を計算して、端末点での受信品質を求めるため、条件によっては計算量が大きくなる。これに対し、端末クラスタリングを行うことにより、各クラスタに含まれる端末装置と、対応する移動中継局装置１０との間のパスロスを計算することで計算量を低減しつつ、位置候補を求めることができる。 Note that performing terminal clustering as in calculation method example 1 has the effect of reducing the amount of calculation. If clustering is not performed, the path loss between each mobile relay station device and all terminal devices in the target area is calculated for all combinations of mobile relay station device placements as explained in calculation method example 2, and the terminal point Since the reception quality is determined at , the amount of calculation becomes large depending on the conditions. On the other hand, by performing terminal clustering, it is possible to obtain position candidates while reducing the amount of calculation by calculating the path loss between the terminal devices included in each cluster and the corresponding mobile relay station device 10. can.
　算出方法例２：
　領域計算部４２は、各移動中継局装置１０がとり得る位置の全候補について、予測通信品質を算出し、予測通信品質が予め定めた値以上となる位置候補を得て、位置候補を包含する領域を最適位置候補領域とする。予測通信品質の計算方法の例は上述したとおりである。 Calculation method example 2:
The area calculation unit 42 calculates predicted communication quality for all position candidates that each mobile relay station device 10 can take, obtains position candidates whose predicted communication quality is equal to or higher than a predetermined value, and includes the position candidates. Let the area be the optimal position candidate area. An example of the method for calculating predicted communication quality is as described above.
　＜Ｓ１０３＞
　Ｓ１０３において、選択部４３は、各移動中継局装置１０の移動予測（いつどの位置にいるかの予測）を行って、最適位置候補領域ごとに、最適位置候補領域における滞在時間が最大となる移動中継局装置１０を選択する。 <S103>
In S103, the selection unit 43 predicts the movement of each mobile relay station device 10 (predicts when and in what position it will be located), and selects a mobile relay that maximizes the stay time in the optimal location candidate region for each optimal location candidate region. Select the station device 10.
　例えば、移動中継局装置１０－１と移動中継局装置１０－２があるとして、選択部４３が、ある最適位置候補領域について、移動中継局装置１０－１は、１１：００から１２：００まで滞在することを検知し、移動中継局装置１０－２は、１１：００から１１：３０まで滞在することを検知すると、移動中継局装置１０－１をその最適位置候補領域についてのＯＮ制御対象として選択する。 For example, assuming that there is a mobile relay station device 10-1 and a mobile relay station device 10-2, the selection unit 43 determines that the mobile relay station device 10-1 is to When the mobile relay station device 10-2 detects that the mobile relay station device 10-2 will stay from 11:00 to 11:30, it sets the mobile relay station device 10-1 as an ON control target for the optimum position candidate area. select.
　各移動中継局装置１０の移動予測の方法については、どのような方法を用いてもよい。例えば、機械学習等による予測値を用いてもよいし、工場等であれば移動中継局装置１０を積載する移動体の制御プログラムから移動予定を取得することで移動予測を行ってもよい。 Any method may be used to predict the movement of each mobile relay station device 10. For example, predicted values based on machine learning or the like may be used, or in the case of a factory or the like, movement prediction may be performed by obtaining a movement schedule from a control program for a mobile body carrying the mobile relay station device 10.
　＜Ｓ１０４＞
　Ｓ１０４において、制御部４４が、Ｓ１０３での選択結果に基づいて、移動中継局装置１０に対するＯＮ／ＯＦＦ制御を実行する。具体的には、制御部４４は、予め定めたメッセージにより、移動中継局装置１０の中継機能のＯＮあるいはＯＦＦを指示する。 <S104>
In S104, the control unit 44 executes ON/OFF control for the mobile relay station device 10 based on the selection result in S103. Specifically, the control unit 44 instructs the mobile relay station device 10 to turn on or off the relay function using a predetermined message.
　例えば、移動中継局装置１０－１が１１：００から１２：００まで最適位置候補領域に滞在する予定である場合において、制御部４４は、移動中継局装置１０－１が最適位置候補領域に入ったことを検知すると（あるいは１１：００になったことを検知すると）、移動中継局装置１０－１の中継機能をＯＮにする制御を実行する。 For example, when the mobile relay station apparatus 10-1 is scheduled to stay in the optimum position candidate area from 11:00 to 12:00, the control unit 44 controls the mobile relay station apparatus 10-1 to enter the optimum position candidate area. When it detects that it is 11:00 (or when it detects that it is 11:00), it executes control to turn on the relay function of the mobile relay station device 10-1.
　（ハードウェア構成例）
　端末装置２０、移動中継局装置１０、基地局装置３０、制御装置４０はいずれも、例えば、コンピュータにプログラムを実行させることにより実現できる。このコンピュータは、物理的なコンピュータであってもよいし、クラウド上の仮想マシンであってもよい。以下、「端末装置２０、移動中継局装置１０、基地局装置３０、制御装置４０」を総称して「装置」と呼ぶ。 (Hardware configuration example)
The terminal device 20, mobile relay station device 10, base station device 30, and control device 40 can all be realized, for example, by causing a computer to execute a program. This computer may be a physical computer or a virtual machine on the cloud. Hereinafter, the "terminal device 20, mobile relay station device 10, base station device 30, and control device 40" will be collectively referred to as the "device."
　すなわち、当該装置は、コンピュータに内蔵されるＣＰＵやメモリ等のハードウェア資源を用いて、当該装置で実施される処理に対応するプログラムを実行することによって実現することが可能である。上記プログラムは、コンピュータが読み取り可能な記録媒体（可搬メモリ等）に記録して、保存したり、配布したりすることが可能である。また、上記プログラムをインターネットや電子メール等、ネットワークを通して提供することも可能である。 That is, the device can be realized by using hardware resources such as a CPU and memory built into a computer to execute a program corresponding to the processing performed by the device. The above program can be recorded on a computer-readable recording medium (such as a portable memory) and can be stored or distributed. It is also possible to provide the above program through a network such as the Internet or e-mail.
　図６は、上記コンピュータのハードウェア構成例を示す図である。図６のコンピュータは、それぞれバスＢＳで相互に接続されているドライブ装置１０００、補助記憶装置１００２、メモリ装置１００３、ＣＰＵ１００４、インタフェース装置１００５、表示装置１００６、入力装置１００７、出力装置１００８等を有する。 FIG. 6 is a diagram showing an example of the hardware configuration of the computer. The computer in FIG. 6 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, etc., which are interconnected by a bus BS.
　当該コンピュータでの処理を実現するプログラムは、例えば、ＣＤ－ＲＯＭ又はメモリカード等の記録媒体１００１によって提供される。プログラムを記憶した記録媒体１００１がドライブ装置１０００にセットされると、プログラムが記録媒体１００１からドライブ装置１０００を介して補助記憶装置１００２にインストールされる。但し、プログラムのインストールは必ずしも記録媒体１００１より行う必要はなく、ネットワークを介して他のコンピュータよりダウンロードするようにしてもよい。補助記憶装置１００２は、インストールされたプログラムを格納すると共に、必要なファイルやデータ等を格納する。 A program that realizes processing on the computer is provided, for example, on a recording medium 1001 such as a CD-ROM or a memory card. When the recording medium 1001 storing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not necessarily need to be installed from the recording medium 1001, and may be downloaded from another computer via a network. The auxiliary storage device 1002 stores installed programs as well as necessary files, data, and the like.
　メモリ装置１００３は、プログラムの起動指示があった場合に、補助記憶装置１００２からプログラムを読み出して格納する。ＣＰＵ１００４は、メモリ装置１００３に格納されたプログラムに従って、当該装置に係る機能を実現する。 The memory device 1003 reads and stores the program from the auxiliary storage device 1002 when there is an instruction to start the program. The CPU 1004 implements functions related to the device according to programs stored in the memory device 1003.
　インタフェース装置１００５は、ネットワーク等に接続するためのインタフェースとして用いられる。表示装置１００６はプログラムによるＧＵＩ（Ｇｒａｐｈｉｃａｌ　Ｕｓｅｒ　Ｉｎｔｅｒｆａｃｅ）等を表示する。入力装置１００７はキーボード及びマウス、ボタン、又はタッチパネル等で構成され、様々な操作指示を入力させるために用いられる。出力装置１００８は演算結果を出力する。なお、表示装置１００６、入力装置１００７、出力装置１００８のうちのいずれか又は全部を備えないこととしてもよい。 The interface device 1005 is used as an interface for connecting to a network or the like. A display device 1006 displays a GUI (Graphical User Interface) and the like based on a program. The input device 1007 is composed of a keyboard, a mouse, buttons, a touch panel, or the like, and is used to input various operation instructions. An output device 1008 outputs the calculation result. Note that any or all of the display device 1006, input device 1007, and output device 1008 may not be provided.
　（実施の形態の効果）
　以上説明したとおり、本実施の形態に係る技術により、移動中継局装置１０に対するＯＮ／ＯＦＦ制御の頻度を低減できるので、接続替えによる瞬間的な通信断や、メッセージングによる帯域圧迫を回避することが可能となる。 (Effects of embodiment)
As explained above, the technology according to the present embodiment can reduce the frequency of ON/OFF control of the mobile relay station device 10, so it is possible to avoid momentary communication interruptions due to connection changes and bandwidth compression due to messaging. It becomes possible.
　（付記）
　本明細書には、少なくとも下記各項の無線通信システム、制御装置、及び制御方法が開示されている。
（付記項１）
　１以上の端末装置との通信を行う１以上の移動無線局装置を備える無線通信システムであって、
　メモリと、
　前記メモリに接続された少なくとも１つのプロセッサと、
　を含み、
　前記プロセッサは、
　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算し、
　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択し、
　選択された移動無線局装置の無線通信機能を稼働させる
　無線通信システム。
（付記項２）
　前記プロセッサは、端末装置に対するクラスタリングを行うことにより、前記配置領域を算出する
　付記項１に記載の無線通信システム。
（付記項３）
　各移動無線局装置は、基地局装置と端末装置との間の通信の中継を行う中継局装置であって、移動体に搭載された中継局装置である
　付記項１又は２に記載の無線通信システム。
（付記項４）
　１以上の端末装置との通信を行う１以上の移動無線局装置と、制御装置とを備える無線通信システムにおける前記制御装置であって、
　メモリと、
　前記メモリに接続された少なくとも１つのプロセッサと、
　を含み、
　前記プロセッサは、
　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算し、
　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択し、
　前記選択部により選択された移動無線局装置の無線通信機能を稼働させる
　制御装置。
（付記項５）
　１以上の端末装置との通信を行う１以上の移動無線局装置を備える無線通信システムにおけるコンピュータが実行する制御方法であって、
　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算出し、
　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択し、
　選択された移動無線局装置の無線通信機能を稼働させる
　制御方法。 (Additional note)
This specification discloses at least the following wireless communication system, control device, and control method.
(Additional note 1)
A wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices,
memory and
at least one processor connected to the memory;
including;
The processor includes:
Calculate the placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality,
Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area,
A wireless communication system that operates the wireless communication functions of selected mobile radio station equipment.
(Additional note 2)
The wireless communication system according to supplementary note 1, wherein the processor calculates the placement area by performing clustering on terminal devices.
(Additional note 3)
Each mobile radio station device is a relay station device that relays communication between a base station device and a terminal device, and is a relay station device mounted on a mobile body. Wireless communication according to supplementary note 1 or 2. system.
(Additional note 4)
The control device in a wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices and a control device,
memory and
at least one processor connected to the memory;
including;
The processor includes:
Calculate the placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality,
Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area,
A control device that operates a wireless communication function of a mobile radio station device selected by the selection unit.
(Additional note 5)
A control method executed by a computer in a wireless communication system comprising one or more mobile radio station devices communicating with one or more terminal devices, the method comprising:
Calculate a placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality,
Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area,
A control method for operating the wireless communication function of a selected mobile radio station device.
　以上、本実施の形態について説明したが、本発明はかかる特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 Although the present embodiment has been described above, the present invention is not limited to such specific embodiment, and various modifications and changes can be made within the scope of the gist of the present invention as described in the claims. It is possible.
１０　移動中継局装置
２０　端末装置
３０　基地局装置
４０　制御装置
４１　情報取得部
４２　領域計算部
４３　選択部
４４　制御部
５０　上位ＮＷ
１０００　ドライブ装置
１００１　記録媒体
１００２　補助記憶装置
１００３　メモリ装置
１００４　ＣＰＵ
１００５　インタフェース装置
１００６　表示装置
１００７　入力装置
１００８　出力装置 10 Mobile relay station device 20 Terminal device 30 Base station device 40 Control device 41 Information acquisition section 42 Area calculation section 43 Selection section 44 Control section 50 Upper NW
1000 Drive device 1001 Recording medium 1002 Auxiliary storage device 1003 Memory device 1004 CPU
1005 Interface device 1006 Display device 1007 Input device 1008 Output device

Claims (5)

  1. 　１以上の端末装置との通信を行う１以上の移動無線局装置を備える無線通信システムであって、
    　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算出する領域計算部と、
    　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択する選択部と、
    　前記選択部により選択された移動無線局装置の無線通信機能を稼働させる制御部と
    　を備える無線通信システム。     A wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices,
    an area calculation unit that calculates a placement area that includes the location of the mobile radio station device in which the communication quality of the terminal device satisfies the required quality;
    a selection unit that selects a mobile radio station device with a maximum residence time in the placement area based on a movement prediction of each mobile radio station device;
    A wireless communication system comprising: a control unit that operates a wireless communication function of a mobile radio station device selected by the selection unit.
  2. 　前記領域計算部は、端末装置に対するクラスタリングを行うことにより、前記配置領域を算出する
    　請求項１に記載の無線通信システム。     The wireless communication system according to claim 1, wherein the area calculation unit calculates the placement area by performing clustering on terminal devices.
  3. 　各移動無線局装置は、基地局装置と端末装置との間の通信の中継を行う中継局装置であって、移動体に搭載された中継局装置である
    　請求項１に記載の無線通信システム。     The wireless communication system according to claim 1, wherein each mobile radio station device is a relay station device that relays communication between a base station device and a terminal device, and is a relay station device mounted on a mobile body.
  4. 　１以上の端末装置との通信を行う１以上の移動無線局装置と、制御装置とを備える無線通信システムにおける前記制御装置であって、
    　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算出する領域計算部と、
    　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択する選択部と、
    　前記選択部により選択された移動無線局装置の無線通信機能を稼働させる制御部と
    　を備える制御装置。     The control device in a wireless communication system comprising one or more mobile radio station devices that communicate with one or more terminal devices and a control device,
    an area calculation unit that calculates a placement area that includes the location of the mobile radio station device in which the communication quality of the terminal device satisfies the required quality;
    a selection unit that selects a mobile radio station device with a maximum residence time in the placement area based on a movement prediction of each mobile radio station device;
    A control device comprising: a control section that operates a wireless communication function of a mobile radio station device selected by the selection section.
  5. 　１以上の端末装置との通信を行う１以上の移動無線局装置を備える無線通信システムにおけるコンピュータが実行する制御方法であって、
    　端末装置の通信品質が所要品質を満たす移動無線局装置の位置を包含する配置領域を算出し、
    　各移動無線局装置の移動予測に基づいて、前記配置領域における滞在時間が最大の移動無線局装置を選択し、
    　選択された移動無線局装置の無線通信機能を稼働させる
    　制御方法。     A control method executed by a computer in a wireless communication system comprising one or more mobile radio station devices communicating with one or more terminal devices, the method comprising:
    Calculate a placement area that includes the location of the mobile radio station device where the communication quality of the terminal device satisfies the required quality,
    Based on the movement prediction of each mobile radio station device, select the mobile radio station device with the maximum residence time in the placement area,
    A control method for operating the wireless communication function of a selected mobile radio station device.
PCT/JP2022/027032 2022-07-07 2022-07-07 Wireless communication system, control device, and control method WO2024009483A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006013811A (en) * 2004-06-24 2006-01-12 Matsushita Electric Ind Co Ltd Information terminal
JP2020025289A (en) * 2009-09-11 2020-02-13 エアロヴァイロンメント インコーポレイテッド Dynamic transmission control for wireless network
JP2021158620A (en) * 2020-03-30 2021-10-07 サクサ株式会社 Radio communication terminal and program

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006013811A (en) * 2004-06-24 2006-01-12 Matsushita Electric Ind Co Ltd Information terminal
JP2020025289A (en) * 2009-09-11 2020-02-13 エアロヴァイロンメント インコーポレイテッド Dynamic transmission control for wireless network
JP2021158620A (en) * 2020-03-30 2021-10-07 サクサ株式会社 Radio communication terminal and program

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